Freiburg will have to do without Hungary forward Roland Sallai for longer after he had an operation on a fractured eye socket. The club said on Wednesday that he underwent surgery on Tuesday and is therefore out of Thursday’s Europa League game at Olympiakos. He will probably miss further matches. “He will be out for a few weeks. The operation went well, but it was inevitable,” coach Christian Streich told a news conference on Wednesday. Sallai was hurt in the 3-2 Bundesliga win at Bayer Leverkusen on September 3 and has not played since. Regardless of Sallai’s situation, Streich said he’s con…